Open stopper



FIG. 1 is a perspective view of an open stopper;

FIG. 2 is a left side view of the open stopper;

FIG. 3 is a front view of the open stopper;

FIG. 4 is a back view of the open stopper;

FIG. 5 is a bottom view of the open stopper;

FIG. 6 is a right side view of the open stopper; and,

FIG. 7 is a top view of the open stopper.

The broken lines are shown for the purpose of illustrating parts of the article that form no part of the claim. 

CLAIM The ornamental design for an open stopper, as shown and described. 